This is a relatively tiny diamond. Take it to a jeweler and ask for an evaluation.
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what ct gold is worth more
It refers to the weight of the diamond.
Whatever you have to sell is worth what someone will pay you for it.The terms you use -- 12 ct tw -- indicate that several diamonds make up the total weight -- tw -- of 12 carats: ct.Take your gems to a certified gemologist who will help you document the characteristics of each stone, which will help you establish a fair market value for the collection.
An eighth of a diamond carat, if it is a round cut, measures about 3.2mm at the girdle.
The letters CT stand for carat, the weight measurement for diamonds. One full carat -- 1.00 CT -- weighs .02 grammes. A diamond weighing 0.010 carat equals one one-hundredth of a carat.